Method for deducting gamma energy spectrum full spectrum background by utilizing successive approximation SNIP (selective non-ip) calculation

Method for deducting gamma energy spectrum full spectrum background by utilizing successive approximation SNIP (selective non-ip) calculation

  • CN 107,219,547 B
  • Filed: 05/26/2017
  • Issued: 12/29/2020
  • Est. Priority Date: 05/26/2017
  • Status: Active Grant
First Claim
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1. The method for deducting the full spectrum background of the gamma energy spectrum by utilizing successive approximation SNIP (selective non-destructive IP) calculation is characterized by being applied to nondestructive testing;

  • further comprising the steps of;

    S1、

    B(n)representing the background area at the time of background subtraction for the nth time, and setting an initial value B(0)1, n is 0, then B is calculated according to the following procedure(n)

    S2, LLS (log-open) transformation is carried out on the data of the gamma energy spectrum;

    zifor the ith trace spectral data, y, after LLS transformationiThe ith channel of spectral data before transformation;

    s3, constructing a vector r with the size equivalent to the energy spectrum length, and enabling ri

    t*FWHMiWherein r isiRepresents the width of the ith energy peak, t is a constant representing the relationship between full peak width and full width at half maximum, and FWHM is the full width at half maximum of the peak;

    s4, setting the parameter m of the filter window as max { ri};

    S5, calculatingWherein p is ∈

    [1, m ]]If p is less than or equal to ri

    If p >

    ri

    Representing the ith trace of spectral data after the p-th transformation in step 2;

    s6, carrying out reverse LLS transformation;

    y isi

    (exp(exp(zi)-1)-1)2-1, obtaining a count for each lane;

    s7, regarding the background deducted for the first time in the step S6 as a new energy spectrum, repeating the steps S1 to S6 to execute background deduction on the basis of the new energy spectrum until the relative error of the background areas obtained in the previous and subsequent times is satisfiedUntil now.

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